Magnetic hardening of Sm2Fe17N3 by radiation damage

File Type:

PDF

Date:

1998

Author:

COEY, JOHN MICHAEL DAVID

Citation:

N. M. Dempsey, M. Ghidini, J. P. Nozieres, P. A. I. Smith, B. Gervais and J. M. D. Coey 'Magnetic hardening of Sm2Fe17N3 by radiation damage' in Physical Review Letters, 81, (25), 1998, pp 5653-5655

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Abstract:

Pinning type coercivity has been induced in large (?50?m) particles of Sm2Fe17N3 by irradiation with 5 GeV Pb56+ ions. Mossbauer spectroscopy is used to analyze the structure of the defects and estimate their volume. Magnetization measurements indicate that the induced defects are anisotropic in shape. A model of strong pinning by cylindrical defects is employed to deduce a defect radius of order 2 nm from the measured fluence dependence of the coercivity.